code: def forward(self, dist):
      dist = dist.unsqueeze(-1) / self.cutoff
      return self.envelope(dist) * (self.freq * dist).sin()
  
imports: import numpy
  from scipy.optimize import brentq
  from scipy import special
  import torch
  from math import sqrt, pi
label_desc: Use image node_id 3 for calling the dist_emb obj's underlying member method code with example usage: obj.forward(dist) and returns: unknown